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Ecologically Favourable Process of Dienes Polymerisation by Cobalt-Containing Catalytic Dithiosystems, Heterogenized on Nano Supports |
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PP: 27-35 |
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Author(s) |
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Zakir Tagizade,
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Abstract |
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| Bifunctional cobalt and nickel containing catalytic dithiosystems, heterogenized on nano supports (Montmorillonite, Halloysite, Al2O3, Silica gel) by pre-alumination method, were studied in the gas phase polymerization of butadiene. The effect of various parameters (catalyst amount, Al:Co ratio, reaction temperature and time, butadiene pressure) on activity and stereo selectivity of heterogenized catalysts was investigated and established the optimal catalyst (Co-DCDTPh+DEAC+BD catalytic system, heterogenized on nano-Hylloysite) and optimal reaction conditions([Me]=1.0●10-7 mol/g support; Al:Co=100:1; T=30oC; τ= 90 min; PBD=1,0 MPa). At optimal conditions were reached the catalyst productivity – 1250-6000 kg PBD/g Co●hour, polybutadiene molecular mass – 95000-1100000 and MWD – 1.20-4.15.
Smaller particle sizes more finely dispersed to optimize yields, decrease in reaction times, possibility to run gas-slurry processes of dienes, are reasons why nanomaterials supported catalysts have received attention and they are known to offer the possibility to display higher catalytic activity and stereo selectivity.
Keywords: heterogenized bifunctional catalysts-stabilizers, cobalt, nickel, |
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